<template>
  <div class="upload-file">
    <el-upload
      multiple
      :action="uploadFileUrl"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="showFileList"
      :headers="headers"
      :on-remove="handleDelete"
      class="upload-file-uploader"
      ref="upload"
    >
      <!-- 上传按钮 -->
      <el-button
        v-if="isShowBtn"
        size="mini"
        type="primary"
        class="upload-btn"
        >{{ $t("选取文件") }}</el-button
      >
      <!-- 上传提示 -->
      <div class="el-upload__tip" slot="tip" v-if="showTip">
        {{ $t("请上传") }}
        <template v-if="fileSize">
          {{ $t("大小不超过") }} <b style="color: #f56c6c">{{ fileSize }}MB</b>
        </template>
        <template v-if="fileType">
          {{ $t("格式为") }}
          <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
        </template>
        {{ $t("的文件") }}
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <transition-group
      class="upload-file-list el-upload-list el-upload-list--text"
      name="el-fade-in-linear"
      tag="ul"
    >
      <li
        :key="file.uid"
        class="el-upload-list__item ele-upload-list__item-content"
        v-for="(file, index) in fileList"
      >
        <el-link
          :href="`${baseUrl}${file.url}`"
          :underline="false"
          target="_blank"
        >
          <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
          <!-- <span class="el-icon-document"> {{ file }} </span> -->
        </el-link>
        <div class="ele-upload-list__item-content-action">
          <el-link
            :underline="false"
            @click="handleDelete(index)"
            type="danger"
            >{{ $t("删除") }}</el-link
          >
        </div>
      </li>
    </transition-group>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";

export default {
  name: "FileUpload",
  props: {
    uploadFileUrl: {
      type: String,
    }, // 上传服务器地址
    // 值
    value: [String, Object, Array],
    //是否展示上传按钮
    isShowBtn: {
      type: Boolean,
      default: true,
    },
    //是否展示文件列表
    showFileList: {
      type: Boolean,
      default: false,
    },
    fileListArr: {
      type: Array,
      default: () => [],
    },
    // 数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["doc", "xls", "ppt", "txt", "pdf", "zip"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      fileList: [],
      baseUrl: process.env.VUE_APP_BASE_API,
      headers: {
        Authorization: "Bearer " + getToken(),
      },
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          let temp = 1;
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(",");
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            if (typeof item === "string") {
              item = { name: item, url: item };
            }
            item.uid = item.uid || new Date().getTime() + temp++;
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
    //编辑回显
    fileListArr: {
      handler(val) {
        if (val.length == 1) {
          this.fileList = val;
        } else if (val.length > 1) {
          //只允许上传一张 取最后一个
          this.fileList = [val[val.length - 1]];
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      // 校检文件类型
      if (this.fileType) {
        let fileExtension = "";
        if (file.name.indexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.indexOf(".") + 1);
        }
        const isTypeOk = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
        if (!isTypeOk) {
          this.$modal.msgError(
            `${this.$t("文件格式不正确, 请上传")}${this.fileType.join(
              "/"
            )}${this.$t("格式文件")}`
          );
          return false;
        }
      }
      // 校检文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(
            `${this.$t("上传文件大小不能超过")} ${this.fileSize} MB!`
          );
          return false;
        }
      }
      this.$modal.loading(this.$t("正在上传文件请稍候"));
      this.number++;
      return true;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(
        `${this.$t("上传文件数量不能超过")} ${this.limit} ${
          this.$t("个") + "!"
        }`
      );
    },
    // 上传失败
    handleUploadError(err) {
      this.$modal.msgError(this.$t("上传失败请重试"));
      this.$modal.closeLoading();
    },
    // 上传成功回调
    handleUploadSuccess(res) {
      console.warn("res", res);
      // this.uploadList.push({ name: res.data, url: res.fileName });
      this.uploadList.push({
        name: res.data[0].name,
        path: res.data[0].path,
        url: res.data[0].path,
      });
      if (this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        this.$emit("input", this.fileList);
        this.$modal.closeLoading();
      }
      this.$message.success(this.$t("上传成功"));
    },
    // 删除文件
    handleDelete(index) {
      this.fileList.splice(index, 1);
      this.$emit("input", this.listToString(this.fileList));
    },
    // 获取文件名称
    getFileName(name) {
      console.warn("name", name);
      if (name.lastIndexOf("/") > -1) {
        return name.slice(name.lastIndexOf("/") + 1);
      } else {
        return "";
      }
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].url + separator;
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
  },
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
.upload-btn {
  width: 96px;
  height: 36px;
  line-height: 36px;
  text-align: center;
  border-radius: 2px;
  border: 1px solid rgba(0, 209, 255, 0.7);
  background-color: rgba(0, 209, 255, 0.2);
  font-size: 14px;
  font-family: Source Han Sans SC;
  font-weight: 400;
  color: #fff;
  cursor: pointer;
}
::v-deep {
  padding: 0;
}
</style>
